js实现一个canvas彩色线条绘制正方形动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：js实现一个canvas彩色线条绘制正方形动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">

  
  
  
<style>
* {
  margin: 0;
  padding: 0;
}
html,
body {
  height: 100%;
  width: 100%;
  font-family: serif;
  overflow: hidden;
  position: relative;
}
canvas {
  display: block;
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  background: #000;
}
</style>




</head>

<body>


<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/dat.gui-min.js"></script>
      <script  type="module">
import { Ease } from '//repo.bfw.wiki/bfwrepo/js/canvas2d/ease.js';
import { Utils } from '//repo.bfw.wiki/bfwrepo/js/canvas2d/utilities.js';

let gui, canvas, c, width, height, frameSize, id, ease, shapes, size, scale, num, maxDist, hexPoints;

const setupGui = () => {
  gui = new dat.GUI();

  gui.params = {
    timeScale: 0.0005,
    ease: 'easeInOutQuart',
    number: 1,
    scale: 150,
    frame: false,
    start: () => start(),
    stop: () => stop() };


  gui.ctrls = {
    timeScale: gui.add(gui.params, 'timeScale', 0.0001, 0.005, 0.0001),
    ease: gui.add(gui.params, 'ease', Ease.returnEaseType()).
    onChange(() => initialize()),
    number: gui.add(gui.params, 'number', 1, 30, 1).
    onChange(() => initialize()),
    scale: gui.add(gui.params, 'scale', 1, 500, 1).
    onChange(() => initialize()),
    frame: gui.add(gui.params, 'frame', false),
    start: gui.add(gui.params, 'start'),
    stop: gui.add(gui.params, 'stop') };


  gui.close();
};

const addFrame = () => {
  c.rect(
  width / 2 - frameSize / 2,
  height / 2 - frameSize / 2,
  frameSize,
  frameSize);

  c.clip();
};

const setupCanvas = () => {
  canvas = document.createElement('canvas');
  document.getElementsByTagName('body')[0].appendChild(canvas);
  c = canvas.getContext('2d');
};

const initialize = () => {
  if (id) {
    cancelAnimationFrame(id);
  }

  width = canvas.width = window.innerWidth;
  height = canvas.height = window.innerHeight;

  ease = Ease.returnEaseFunc(gui.params.ease);

  shapes = new Array();
  scale = gui.params.scale;
  num = gui.params.number;
  frameSize = Math.min(width * 0.9, height * 0.9);
  maxDist = 0;

  hexPoints = getPolygonPoints(360, 4);
  shapes = getSquareGrid(num);

  draw(0);
};

const getSquareGrid = num => {
  const vectors = new Array();

  for (let x = -num; x <= num; x++) {
    for (let y = -num; y <= num; y++) {
      vectors.push([x, y]);
    }
  }

  const tmp = new Array();

  for (let i = 0; i < vectors.length; i++) {
    const params = {};
    const x = vectors[i][0] * scale;
    const y = vectors[i][1] * scale;
    const d = Math.sqrt(x * x + y * y);

    params.x = x;
    params.y = y;
    params.d = d;
    params.i = i;

    maxDist = Math.max(d, maxDist);

    tmp.push(params);
  }

  size = Math.floor(scale * Math.sqrt(2) / 2);
  //size = scale / 2;

  return tmp;
};

const getHexGrid = num => {
  const vectors = new Array();

  for (let x = -num; x <= num; x++) {
    for (let y = -num; y <= num; y++) {
      for (let z = -num; z <= num; z++) {
        if (x + y + z === 0) {
          vectors.push([x, y]);
        }
      }
    }
  }

  const tmp = new Array();

  for (let i = 0; i < vectors.length; i++) {
    const params = {};
    const x = Math.sqrt(3) * (vectors[i][0] + vectors[i][1] / 2) / 2 * scale;
    const y = 3 / 2 * vectors[i][1] / 2 * scale;
    const d = Math.sqrt(x * x + y * y);

    params.x = x;
    params.y = y;
    params.d = d;

    maxDist = Math.max(d, maxDist);

    tmp.push(params);
  }

  size = Math.sqrt(3) * (scale / 2) / 2;

  return tmp;
};

const getSquareGrid2 = num => {
  const tmp = new Array();
  const ajust = num * scale / 2 - scale / 2;

  for (let y = 0; y < num; y++) {
    for (let x = 0; x < num; x++) {
      const params = {};
  .........完整代码请登录后点击上方下载按钮下载查看